The best  aspects of man`s relationship with animals are the following:

people take care of animals. help them in their lives. feed them. give their love to them.Those things make people kinder not only to animals but to people too.

And  the worst aspects of man`s relationship with animals are: people don*t take care of animals or do it badly. they abandon dogs and cats. they beat them. Often animals can hurt people. bite them. for ex.